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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8866) SampleQuantiles#query is O(N^2) instead of O(N)
Date Sat, 29 Sep 2012 01:09:09 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466066#comment-13466066
] 

Hudson commented on HADOOP-8866:
--------------------------------

Integrated in Hadoop-Hdfs-trunk-Commit #2850 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk-Commit/2850/])
    HADOOP-8866. SampleQuantiles#query is O(N^2) instead of O(N). Contributed by Andrew Wang.
(Revision 1391711)

     Result = SUCCESS
atm : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1391711
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/util/SampleQuantiles.java

                
> SampleQuantiles#query is O(N^2) instead of O(N)
> -----------------------------------------------
>
>                 Key: HADOOP-8866
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8866
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 2.0.2-alpha
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>            Priority: Minor
>             Fix For: 2.0.3-alpha
>
>         Attachments: hdfs-3976-1.patch
>
>
> SampleQuantiles#query() does O(N) calls LinkedList#get() in a loop, rather than using
an iterator. This makes query O(N^2), rather than O(N).

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